Under Armour Data Breach Investigation

Chimicles Schwartz Kriner & Donaldson-Smith LLP is investigating potential class action claims against Under Armour, Inc. following reports of a significant data security incident. This incident may have impacted the personal information of millions of individuals, including customers and possibly employees.

What Happened at Under Armour?

In or around November 2025, the Everest ransomware group claimed responsibility for a breach of Under Armour’s systems, allegedly exfiltrating 343 GB of sensitive data. Reports indicate that the stolen data includes customer shopping histories, email addresses, phone numbers, and other account-related details. A sample of the stolen data was posted on a dark web leak site, and the threat actor issued a seven-day ultimatum to Under Armour.

What Information Was Compromised?

The compromised data reportedly includes:

Names and contact details
Purchase history and transaction identifiers
Marketing and account metadata

Why Is This Important?

Exposure of this information places affected individuals at risk of identity theft, phishing attacks, and fraud. Sensitive identifiers combined with purchase and location data can enable sophisticated scams.

What Should You Do?

If you have purchased Under Armour products or were employed by Under Armour, and believe your personal information may have been compromised, please contact one of our data breach attorneys by filling out the form below to learn more about your legal rights.

Under Armour Data Breach (#858)

This is a questionnaire is created by the law firm of Chimicles Schwartz Kriner & Donaldson-Smith LLP (CSK&D) to investigate potential claims related to this data breach. Your answers will be screened, and you may be contacted if your responses match certain criteria.

When you submit this form, it will not automatically collect your details like name and email address unless you provide it yourself.

First Name

Last Name

Address

Address Line 1

City

State

Zip Code

Phone

Did you receive a data breach notification letter concerning the Under Armour data breach?

Are you a customer or employee of Under Armour?

Have you gotten an increase in spam or junk calls, texts, and emails recently?

Have you experienced any fraud as a result?

If so, please provide more details:

Please provide any additional details about your experience:

(*) Indicates required field: When communicating with us through this site or otherwise in connection with a matter for which we do not already represent you, your communication may not be treated as privileged or confidential, and does not create an attorney-client relationship between you and our Firm.

Under Armour Data Breach Investigation

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